Not necessarily. The parrotlet is a very tiny bird, maybe not bigger than your pinky when they're chilling out. And whatever happened to the Bee Hummingbird? Anyways, evolutions has her own reason for everything.
Flying birds are not always larger. There are many bats bigger than many kinds of birds.
Most commonly, yes.
grow up
because they have bigger traits
yes
Armidillos usually grow larger than a hedgehog.
Males that are much larger than females.
well, a bird that cant fly has a larger body mass than one that can
no! what are you crazy!?
yes
A little larger than a jawbreaker.
Brown bear